Dye liquid crystal composition and application thereof

Abstract

The invention discloses a dye liquid crystal composition and application thereof, and belongs to the technical field of liquid crystal materials. The dye liquid crystal composition is composed of a liquid crystal main body, dichroic dye and a chiral agent, and the liquid crystal main body is composed of at least one compound represented by a general formula I, at least one compound represented by a general formula II, at least one compound represented by a general formula III and at least one compound represented by a general formula IV: I, II, III and IV. The dye liquid crystal composition provided by the invention has the advantages of higher contrast ratio, higher response speed and wider working temperature range, and the intermiscibility of the dye and the liquid crystal is better.

Description

TECHNICAL FIELD

[0001] The present application relates to compositions and their use, in particular to a dye liquid crystal composition consisting of a liquid crystal host and a dichroic dye and the use of the dye liquid crystal composition in a normally white mode display device made of rigid or flexible substrates, belonging to the technical field of liquid crystal materials. BACKGROUND

[0002] How to improve the quality of liquid crystal display, better realize the liquid crystal colorization is the main research direction of liquid crystal display application. Among them, the dye liquid crystal technology based on the guest-host effect is widely concerned because of its unique advantages. The dye liquid crystal technology dopes a certain amount of dichroic dye (guest) in the liquid crystal host (host), because the arrangement of liquid crystal molecules is controlled by electric field, and then the orientation of dye molecules changes, so the dye liquid crystal can realize color display of different gray scales. The device prepared based on dye liquid crystal has the advantages of bright color, display color tone not affected by viewing angle, etc., and has great potential in practical application.

[0003] However, the existing dye liquid crystal system based on the guest-host effect generally has problems such as limited dye solubility, low contrast, dynamic response lag, etc., especially in flexible substrate applications, which is easily affected by mechanical deformation and temperature fluctuation. SUMMARY

[0004] In order to solve the problems in the prior art, the purpose of the present application is to provide a dye liquid crystal composition which has good compatibility with dyes and liquid crystals, high contrast, fast response speed and wide working temperature range.

[0005] In order to achieve the above-mentioned object, the technical scheme adopted by the present application is as follows: A dye liquid crystal composition, consisting of a liquid crystal host, a dichroic dye and a chiral agent, wherein: The liquid crystal host consists of at least one compound represented by general formula I, at least one compound represented by general formula II, at least one compound represented by general formula III and at least one compound represented by general formula IV: I; II; III; IV; R1, R2, R3, R4, R5, R6, R7 each independently represents a straight chain alkyl group of 1 to 12 carbon atoms, a straight chain alkoxy group of 1 to 12 carbon atoms or a straight chain alkenyl group of 2 to 12 carbon atoms; 、 、 、 、 、 each independently represents 、 、 、 or ; The dichroic dye consists of at least one compound represented by the general formula D-AI, at least one compound represented by the general formula D-BI, at least one compound represented by the general formula D-II, and at least one compound represented by the general formula D-III: D-AI; D-BI; D-II; D-III; DR1, DR2, DR3, DR4, DR5 each independently represent a halogenated or non-halogenated alkyl group having 1 to 10 carbon atoms, one or more CH2 groups in the alkyl group can be replaced independently of one another by -C≡C-, -CH=CH-, -CF=CF-, -CF=CH-, -CH=CF-, -(CO)O-, -O(CO)-, -(CO)-, -O- or -S-, the O and S atoms are not directly linked; C1, C2 each independently represent 、 、 , an amino group or a halogenated or non-halogenated alkyl group having 1 to 10 carbon atoms, one or more CH2 groups in the alkyl group can be replaced independently of one another by -C≡C-, -CH=CH-, -CF=CF-, -CF=CH-, -CH=CF-, -(CO)O-, -O(CO)-, -(CO)-, -O- or -S-, the O and S atoms are not directly linked; L1 represents a substituted or non-substituted arylene group having 1 to 10 carbon atoms, a substituted or non-substituted heteroarylene group having 2 to 50 carbon atoms, wherein the substituents are alkyl groups having 1 to 12 carbon atoms, alkoxy groups having 1 to 18 carbon atoms or halogens; L2 represents a hydrogen atom, a substituted or non-substituted alkyl group having 1 to 12 carbon atoms, a substituted or non-substituted alkenyl group having 2 to 6 carbon atoms, a substituted or non-substituted alkoxy group having 1 to 18 carbon atoms, a substituted or non-substituted alkylamino group having 1 to 18 carbon atoms, a substituted or non-substituted cycloalkoxy group having 5 to 12 carbon atoms, a substituted or non-substituted alkenyloxy group having 2 to 18 carbon atoms, -C≡N, a halogenated alkyl group having 1 to 4 carbon atoms, a sulfo group, an acyl group, an acylamino group having 2 to 18 carbon atoms, an acyloxy group having 2 to 18 carbon atoms, a substituted or non-substituted aryl group having 1 to 10 carbon atoms, a substituted or non-substituted heteroaryl group having 2 to 50 carbon atoms, wherein the substituents are alkyl groups having 1 to 18 carbon atoms, alkoxy groups having 1 to 18 carbon atoms or halogens; The chiral agent is R / S 811 or R / S 5011, the structure of which is shown below: R / S811; R / S5011; The compounds represented by general formula I, general formula II, general formula III and general formula IV are respectively 5-25%, 1-10%, 30-60%, 20-40% of the total weight of the liquid crystal main body, the compounds represented by general formula D-AI, general formula D-BI, general formula D-II and general formula D-III are respectively 0.23-1.29%, 0.1-0.56%, 0.12-0.67%, 0.55-3.08% of the weight of the liquid crystal main body, and the addition amount of the chiral agent is 0.06-1.5% of the weight of the liquid crystal main body.

[0006] The compound represented by general formula I is selected from: I-1; I-2; I-3; I-4; I-5; I-6; I-7; I-8; I-9 and I-10.

[0007] The compound represented by general formula II is selected from: II-1; II-2; II-3; II-4; II-5; II-6; II-7; II-8; II-9 and II-10.

[0008] The compound represented by general formula III is selected from: III-1; III-2; III-3; III-4; III-5; III-6; III-7; III-8; III-9 and III-10.

[0009] The compounds represented by the general formula IV are selected from: IV-1; IV-2; IV-3; IV-4; IV-5; IV-6; IV-7; IV-8; IV-9 and IV-10.

[0010] The compounds represented by the general formula D-AI are selected from: D-AI-1; D-AI-2; D-AI-3; and D-AI-4.

[0011] The compounds represented by the general formula D-BI are selected from: D-BI-1; D-BI-2; D-BI-3; and D-BI-4.

[0012] The compounds represented by the general formula D-II are selected from: D-II-1; D-II-2; D-II-3; and D-II-4.

[0013] The compounds represented by the general formula D-III are selected from: D-III-1; D-III-2; D-III-3; D-III-4; and D-III-5.

[0014] The aforementioned dye liquid crystal composition is applied in a normally white display device formed by a rigid or flexible substrate.

[0015] The present application has the advantages of: (1) The liquid crystal monomers used in the present application are all liquid crystal monomers with a rigid core structure with double fluorine substitution, and the viscosity is low, which effectively reduces the viscosity of the liquid crystal host, thereby improving the response speed of the dye liquid crystal composition; (2) The present application significantly improves the clearing point of the liquid crystal host by optimizing the types and proportions of the liquid crystal monomers, thereby expanding the working temperature range of the dye liquid crystal composition; (3) The present application significantly improves the compatibility of the dichroic dye and the liquid crystal host by optimizing the types and proportions of the liquid crystal host and the dichroic dye; (4) The present application further improves the contrast of the dye liquid crystal composition by adding a chiral agent and optimizing the types and proportions of the chiral agent; (5) Based on the guest-host effect, the present application improves the absorption anisotropy of the dichroic dye by the synergistic alignment of the liquid crystal monomer with a rigid core structure with double fluorine substitution and the dichroic dye molecule with a specific dipole moment, and by adding a specific chiral agent to make the structure of the above-mentioned liquid crystal monomer and dichroic dye molecule rotate, thereby improving the absorption anisotropy of the dichroic dye. The dye liquid crystal composition prepared has a fast dynamic response speed, a wide working temperature range and excellent contrast, and can be applied in a normally white display device formed by a rigid or flexible substrate. DETAILED DESCRIPTION

[0016] The components used in the examples, the preparation of the dye liquid crystal composition and the performance parameters of the dye liquid crystal composition are all obtained by conventional methods.

[0017] The percentages in the examples represent weight percentages unless otherwise specified.

[0018] T （N，I） (℃) represents the clearing point.

[0019] △n represents the optical anisotropy at 20℃, 589nm.

[0020] △ε represents the dielectric anisotropy at 25℃, 1kHz.

[0021] η (mPa-s) represents a flow viscosity at 20°C.

[0022] V0 (V) represents a threshold voltage at 20°C.

[0023] I0 (μA) represents an initial power consumption current.

[0024] I 180 (μA) represents a power consumption current after irradiation for 180 seconds by an ultraviolet lamp with an irradiation intensity of 4 mW / cm 2 .

[0025] t on (ms) represents an on-state response time.

[0026] t off (ms) represents an off-state response time.

[0027] T on (%) represents an on-state transmittance.

[0028] T off (%) represents an off-state transmittance.

[0029] CR represents a contrast ratio, CR = T off / T on .

[0030] I. Composition of dye liquid crystal composition The dye liquid crystal composition provided by the present application is composed of a liquid crystal main body, a dichroic dye, and a chiral agent.

[0031] 1. Liquid crystal main body The liquid crystal main body is composed of at least one compound represented by general formula I, at least one compound represented by general formula II, at least one compound represented by general formula III, and at least one compound represented by general formula IV.

[0032] I; II; III; IV; R1, R2, R3, R4, R5, R6, R7 each independently represents a straight chain alkyl group of 1 to 12 carbon atoms, a straight chain alkoxy group of 1 to 12 carbon atoms, or a straight chain alkenyl group of 2 to 12 carbon atoms; , , , , , each independently represents , , 、 or .

[0033] wherein the compounds represented by general formula I are selected from: I-1; I-2; I-3; I-4; I-5; I-6; I-7; I-8; I-9 and I-10.

[0034] the compounds represented by general formula II are selected from: II-1; II-2; II-3; II-4; II-5; II-6; II-7; II-8; II-9 and II-10.

[0035] the compounds represented by general formula III are selected from: III-1; III-2; III-3; III-4; III-5; III-6; III-7; III-8; III-9 and III-10.

[0036] the compounds represented by general formula IV are selected from: IV-1; IV-2; IV-3; IV-4; IV-5; IV-6; IV-7; IV-8; IV-9 and IV-10.

[0037] In the liquid crystal host, the compound represented by general formula I accounts for 5-25% of the total weight of the liquid crystal host, the compound represented by general formula II accounts for 1-10% of the total weight of the liquid crystal host, the compound represented by general formula III accounts for 30-60% of the total weight of the liquid crystal host, and the compound represented by general formula IV accounts for 20-40% of the total weight of the liquid crystal host. The liquid crystal host with the above-mentioned ratio has a high clearing point and a low flow viscosity, and has good solubility for the following dichroic dye as "host" in the guest-host effect.

[0038] 2. Dichroic dye The dichroic dye consists of at least one compound represented by general formula D-AI, at least one compound represented by general formula D-BI, at least one compound represented by general formula D-II, and at least one compound represented by general formula D-III, and is black.

[0039] D-AI; D-BI; D-II; D-III.

[0040] DR1, DR2, DR3, DR4, DR5 each independently represents 1 to 10 carbon atom halogenated or unhalogenated alkyl, one or more CH2 groups in the alkyl group can be replaced by -C=C-, -CH=CH-, -CF=CF-, -CF=CH-, -CH=CF-, -(CO)O-, -O(CO)-, -(CO)-, -O- or -S- independently of each other, and the O atom and the S atom are not directly connected.

[0041] C1, C2 each independently represents , , , amino or 1 to 10 carbon atom halogenated or non-halogenated alkyl, one or more CH2 groups in the alkyl can be replaced independently of one another by -C=C-, -CH=CH-, -CF=CF-, -CF=CH-, -CH=CF-, -(CO)O-, -O(CO)-, -(CO)-, -O- or -S- and the O and S atoms are not directly connected.

[0042] L1 represents a substituted or unsubstituted 1 to 10 carbon atom arylene group, a substituted or unsubstituted 2 to 50 carbon atom heteroarylene group, wherein the substituents are 1 to 12 carbon atom alkyl, 1 to 18 carbon atom alkoxy or halogen; L2 represents a hydrogen atom, a substituted or unsubstituted 1 to 12 carbon atom alkyl, a substituted or unsubstituted 2 to 6 carbon atom alkenyl, a substituted or unsubstituted 1 to 18 carbon atom alkoxy, a substituted or unsubstituted 1 to 18 carbon atom alkylamino, a substituted or unsubstituted 5 to 12 carbon atom cycloalkoxy, a substituted or unsubstituted 2 to 18 carbon atom alkenyloxy, -C≡N, 1 to 4 carbon atom halogenated alkyl, sulfo, acyl, 2 to 18 carbon atom acylamino, 2 to 18 carbon atom acyloxy, a substituted or unsubstituted 1 to 10 carbon atom aryl, a substituted or unsubstituted 2 to 50 carbon atom heteroaryl, wherein the substituents are 1 to 18 carbon atom alkyl, 1 to 18 carbon atom alkoxy or halogen.

[0043] The compounds represented by the general formula D-AI are selected from the group consisting of: D-AI-1; D-AI-2; D-AI-3; and D-AI-4.

[0044] The compounds represented by the general formula D-BI are selected from the group consisting of: D-BI-1; D-BI-2; D-BI-3; and D-BI-4.

[0045] The compounds represented by the general formula D-II are selected from the group consisting of: D-II-1; D-II-2; D-II-3; and D-II-4.

[0046] The compound represented by general formula D-III is selected from: D-III-1; D-III-2; D-III-3; D-III-4; and D-III-5.

[0047] In the dichroic dye, the compound represented by general formula D-AI is used in an amount of 0.23-1.29% by weight of the liquid crystal host, the compound represented by general formula D-BI is used in an amount of 0.1-0.56% by weight of the liquid crystal host, the compound represented by general formula D-II is used in an amount of 0.12-0.67% by weight of the liquid crystal host, and the compound represented by general formula D-III is used in an amount of 0.55-3.08% by weight of the liquid crystal host. The dichroic dye in the above ratio has good solubility in the above liquid crystal host as a guest in the guest-host effect.

[0048] 3. Chiral agent The chiral agent is R / S811 or R / S5011, and the structures are shown as follows: R / S811; R / S5011.

[0049] In the dye liquid crystal composition, the chiral agent is added in an amount of 0.06-1.5% by weight of the liquid crystal host. The addition of the chiral agent causes the above liquid crystal monomer to rotate in the device, resulting in the rotation of the above dichroic dye molecules following the liquid crystal monomer, and further enabling the above dichroic dye molecules to fully absorb polarized light in each direction, thereby further improving the contrast of the dye liquid crystal composition.

[0050] The above dye liquid crystal composition provided by the present application exhibits a highly ordered planar arrangement in a zero electric field state, and can realize the reference light transmittance characteristics of the normal white mode. After an electric field is applied, the dichroic dye molecules rotate rapidly following the liquid crystal host, and a rapid light switching effect can be formed. By adjusting the spatial steric hindrance effect of the alkyl length of the liquid crystal host compound and the terminal polar group, the liquid crystal host can maintain excellent phase stability in a wide temperature range.

[0051] II. Performance of the dye liquid crystal composition For convenience of expression, the structures of the dye molecules and the liquid crystal molecules are represented by code combination. The codes of the ring structures are shown in Table 1, the codes of the linking groups are shown in Table 2, and the codes of the terminal groups are shown in Table 3.

[0052] Table 1 Code of ring structure

[0053] Table 2 Code of connecting group

[0054] Table 3 Code of terminal group

[0055] Code combination rule: code of intermediate ring structure and connecting group from left to right-code of left terminal group-code of right terminal group.

[0056] Example: Molecular structure: Code combination: PY-1V2-O1.

[0057] Molecular structure: Code combination: CY-3-O1.

[0058] Molecular structure: Code combination: CCY-5-O3.

[0059] Molecular structure: Code combination: PGP-2-3.

[0060] Comparative Example 1 The composition of liquid crystal composition CR is as follows in mass percentage: CY-3-O2 9%, CY-5-O2 9%, CY-3-O4 10%, CZCY-3-O2 4%, CZCY-3-O3 4%, CCY-5-O2 4%, CCY-5-O2 5%, CCY-5-O3 5%, CCY-3-O3 4%, CPY-2-O2 4%, CPY-3-O2 4%, CPY-4-O2 3%, PZYP-2-4 10%, PZYP-2-3 10%, PGP-2-3 10%, PGP-4-2 10%.

[0061] The performance parameter test results of liquid crystal composition CR are as follows: T （N，I） = 96℃, Δn = 0.109, Δε = -5.2, η = 83 mPa·s, V0 = 1.89 V, I0 = 0.17 μA, I 180 = 0.33 μA.

[0062] The liquid crystal monomers used in the liquid crystal composition CR are all conventional liquid crystal monomers used in VA display mode, which are simple to prepare, easy to obtain and low in cost, and thus are widely used in liquid crystal VA display mode and are a relatively common liquid crystal composition in the industry.

[0063] Comparative Example 2 The dye liquid crystal composition A is composed of the liquid crystal composition CR, the dichroic dye and the chiral agent.

[0064] The composition of the dye liquid crystal composition A in terms of mass percentage is specifically as follows: Liquid crystal composition CR 100%, formula D-AI-2 0.23%, formula D-BI-4 0.10%, formula D-II-3 0.12%, formula D-III-2 0.25%, formula D-III-3 0.30%, S811 1.30%.

[0065] The performance parameter test results of the dye liquid crystal composition A are as follows: I0=0.26μA; I 180 =0.57μA, t on =46.7ms, t off =60.2ms, T on =42.3%, T off =76.8%, CR=1.8.

[0066] The dye liquid crystal composition A as a whole presents black color, the response speed is slightly slow, and the contrast ratio is poor. Under normal temperature conditions, the maximum solubility of the dichroic dye in the liquid crystal composition CR under this ratio is only 2%, and the solubility is poor.

[0067] Example 1

[0068] The composition of the liquid crystal composition CR in terms of mass percentage is as follows: CY-3-O2 9%, CY-5-O2 9%, CY-3-O4 10%, CZCY-3-O2 4%, CZCY-3-O3 4%, CCY-5-O2 4%, CCY-5-O2 5%, CCY-5-O3 5%, CCY-3-O3 4%, CPY-2-O2 4%, CPY-3-O2 4%, CPY-4-O2 3%, PZYP-2-4 10%, PZYP-2-3 10%, PGP-2-3 10%, PGP-4-2 10%.

[0069] The performance parameter test results of the liquid crystal composition CR are as follows: T （N，I）= 96℃, Δn = 0.109, Δε = -5.2, η = 83 mPa s, V0= 1.89 V, I0= 0.17 μA, I 180 = 0.33 μA.

[0070] The liquid crystal monomers used in the liquid crystal composition CR are all conventional liquid crystal monomers used in VA display mode, which have the characteristics of simple preparation, easy availability of materials and low cost, and are therefore widely used in liquid crystal VA display mode and are a relatively common liquid crystal composition in the industry.

[0071] Example 2

[0072] The composition of the liquid crystal host LC2 is as follows in mass percentage: General formula I: PV-1V2-O1 9%, PV-1V2-O2 9%; General formula II: CY-3O2 10%; General formula III: CCY-3-O2 4%, CCY-4-O2 4%, CCY-5-O2 4%, CCY-5-O3 5%, CCY-3-O3 4%, CPY-2-O2 4%, CPY-3-O2 4%, CPY-4-O2 3%; General formula IV: PYP-2-4 10%, PYP-2-3 10%, PGP-2-3 10%, PGP-4-2 10%.

[0073] The performance parameter test results of the liquid crystal host LC2 are as follows: T （N，I） = 108℃, Δn = 0.189, Δε = -3.8, η = 40 mPa s, V0= 2.26 V, I0= 0.06 μA, I 180 = 0.09 μA.

[0074] Example 3

[0075] The composition of the liquid crystal host LC3 is as follows in mass percentage: General formula I: PV-1V2-O1 11%, PV-1V2-O2 11%; General formula II: CY-3O2 2%; General formula III: CCY-3-O2 4%, CCY-4-O2 4%, CCY-5-O2 6%, CCY-5-O3 5%, CCY-3-O3 4%, CPY-2-O2 7%, CPY-3-O2 7%, CPY-4-O2 8%; General formula IV: PYP-2-4 8%, PYP-2-3 7%, PGP-2-3 8%, PGP-4-2 8%.

[0076] The performance parameter test results of the liquid crystal host LC3 are as follows: T （N，I） = 109℃, Δn = 0.195, Δε = -3.4, η = 55 mPa·s, V0 = 2.29 V, I0 = 0.01 μA, I 180 = 0.03 μA.

[0077] Example 4

[0078] The composition of the liquid crystal host LC4 is as follows in mass percentage: General formula I: PV-1V2-O1 7%, PV-1V2-O2 10%; General formula II: CY-3O2 6%; General formula III: CCY-3-O2 6%, CCY-4-O2 7%, CCY-5-O2 7%, CCY-5-O3 5%, CCY-3-O3 6%, CPY-2-O2 8%, CPY-3-O2 8%, CPY-4-O2 8%; General formula IV: PYP-2-4 6%, PYP-2-3 6%, PGP-2-3 5%, PGP-4-2 5%.

[0079] The performance parameter test results of the liquid crystal host LC4 are as follows: T （N，I） = 109℃, Δn = 0.095, Δε = -3.4, η = 15 mPa·s, V0 = 2.29 V, I0 = 0.04 μA, I 180 = 0.06 μA.

[0080] It can be known from Comparative Example 1 and Examples 1 to 4 that the clearing point (T （N，I） ) of the liquid crystal host (LC1, LC2, LC3, LC4) provided by the present application is significantly higher than that of the existing liquid crystal composition (CR), which means that the liquid crystal host (LC1, LC2, LC3, LC4) provided by the present application has a wider working temperature range and is not easily affected by temperature fluctuations in flexible substrate applications.

[0081] Example 5

[0082] The dye liquid crystal composition B1 is composed of the liquid crystal host LC1, a dichroic dye and a chiral agent.

[0083] The composition of the dye liquid crystal composition B1 is specifically as follows in mass percentage: Liquid crystal host LC1 100%, Formula D-AI-2 0.23%, Formula D-BI-4 0.10%, Formula D-II-3 0.12%, Formula D-III-2 0.25%, Formula D-III-3 0.30%, S811 1.30%.

[0084] The performance parameter test results of dye liquid crystal composition B1 are as follows: I0=0.11 μA, I 180 =0.23 μA, t on =16.7 ms, t off =20.2 ms, T on =35.3%, T off =76.6%, CR=2.2.

[0085] The dye liquid crystal composition B1 as a whole presents black color. Compared with the dye liquid crystal composition A, the response speed of the dye liquid crystal composition B1 is significantly improved, and the contrast ratio is improved. At normal temperature, the solubility of the dichroic dye in the liquid crystal host LC1 under the above-mentioned proportion is greater than 10%. Compared with in the liquid crystal composition CR, the dichroic dye under the above-mentioned proportion has better solubility in the liquid crystal host LC1, which can provide better dark state shielding.

[0086] Example 6

[0087] The dye liquid crystal composition B2 is composed of a liquid crystal host LC1, a dichroic dye and a chiral agent.

[0088] The composition of the dye liquid crystal composition B2 in terms of mass percentage is specifically as follows: Liquid crystal host LC1 100%, Formula D-AI-2 0.46%, Formula D-BI-4 0.20%, Formula D-II-3 0.25%, Formula D-III-2 0.50%, Formula D-III-3 0.60%, S5011 0.12%.

[0089] The performance parameter test results of the dye liquid crystal composition B2 are as follows: I0=0.13 μA, I 180 =0.29 μA, t on =13.3 ms, t off =18.2 ms, T on =21.3%, T off =66.2%, CR=3.1.

[0090] The dye liquid crystal composition B2 as a whole presents black color. Compared with the dye liquid crystal composition A, the response speed of the dye liquid crystal composition B2 is significantly improved, and the contrast ratio is significantly improved. Under normal temperature conditions, the maximum solubility of the dichroic dye under this ratio in the liquid crystal host LC1 is greater than 10%, and the solubility is better.

[0091] Example 7

[0092] The dye liquid crystal composition B3 is composed of a liquid crystal host LC2, a dichroic dye and a chiral agent.

[0093] The composition of the dye liquid crystal composition B3 in mass percentage is specifically as follows: The liquid crystal host LC2 is 100%, the formula D-AI-2 is 0.78%, the formula D-BI-4 is 0.34%, the formula D-II-3 is 0.41%, the formula D-III-2 is 0.85%, the formula D-III-3 is 1.02%, and S5011 is 0.15%.

[0094] The performance parameter test results of the dye liquid crystal composition B3 are as follows: I0=0.08μA, I 180 =0.11μA, t on =12.7ms, t off =17.3ms, T on =12.7%, T off =56.9%, CR=4.4.

[0095] The dye liquid crystal composition B3 as a whole presents black color. Compared with the dye liquid crystal composition A, the response speed of the dye liquid crystal composition B3 is significantly improved, and the contrast ratio is significantly improved. Under normal temperature conditions, the maximum solubility of the dichroic dye under this ratio in the liquid crystal host LC2 is greater than 10%, and the solubility is better.

[0096] Example 8

[0097] The dye liquid crystal composition B4 is composed of a liquid crystal host LC2, a dichroic dye and a chiral agent.

[0098] The composition of the dye liquid crystal composition B4 in mass percentage is specifically as follows: The liquid crystal host LC2 is 100%, the formula D-AI-2 is 1.29%, the formula D-BI-4 is 0.56%, the formula D-II-3 is 0.67%, the formula D-III-2 is 1.40%, the formula D-III-3 is 1.68%, and S5011 is 0.15%.

[0099] The performance parameter test results of the dye liquid crystal composition B4 are as follows: I0=0.11μA, I 180= 0.26 μA, t on = 13.8 ms, t off = 22.7 ms, T on = 5.1%, T off = 37.2%, CR = 7.3.

[0100] The dye liquid crystal composition B4 as a whole presents black color. Compared with the dye liquid crystal composition A, the response speed of the dye liquid crystal composition B4 is significantly improved, and the contrast ratio is greatly improved. Under normal temperature conditions, the maximum solubility of the dichroic dye under this ratio in the liquid crystal host LC2 is greater than 10%, and the solubility is better.

[0101] Example 9

[0102] The dye liquid crystal composition B5 is composed of a liquid crystal host LC3, a dichroic dye and a chiral agent.

[0103] The composition of the dye liquid crystal composition B5 is specifically as follows in terms of mass percentage: Liquid crystal host LC3 100%, formula D-AI-2 0.78%, formula D-BI-4 0.34%, formula D-II-3 0.41%, formula D-III-2 0.85%, formula D-III-3 1.02%, S811 1.10%.

[0104] The performance parameter test results of the dye liquid crystal composition B5 are as follows: I0= 0.03 μA, I 180 = 0.06 μA, t on = 18.8 ms, t off = 25.3 ms, T on = 14.0%, T off = 58.1%, CR = 4.2.

[0105] The dye liquid crystal composition B5 as a whole presents black color. Compared with the dye liquid crystal composition A, the response speed of the dye liquid crystal composition B5 is significantly improved, and the contrast ratio is greatly improved. Under normal temperature conditions, the maximum solubility of the dichroic dye under this ratio in the liquid crystal host LC3 is greater than 10%, and the solubility is better. Compared with in the liquid crystal host LC2, the dichroic dye has better stability in the liquid crystal host LC3 under the same addition amount, and the power consumption current of the dye liquid crystal composition is lower.

[0106] Example 10

[0107] The dye liquid crystal composition B6 is composed of a liquid crystal host LC3, a dichroic dye and a chiral agent.

[0108] The composition of the dye liquid crystal composition B6 is specifically as follows in terms of mass percentage: Liquid crystal host LC3 100%, Formula D-AI-2 1.29%, Formula D-BI-4 0.56%, Formula D-II-3 0.67%, Formula D-III-2 1.40%, Formula D-III-3 1.68%, S5011 0.10%.

[0109] The performance parameter test results of the dye liquid crystal composition B6 are as follows: I0=0.04μA, I 180 =0.07μA, t on =17.7ms, t off =21.0ms, T on =5.9%, T off =38.5%, CR=6.5.

[0110] The dye liquid crystal composition B6 as a whole presents black color. Compared with the dye liquid crystal composition A, the response speed of the dye liquid crystal composition B6 is significantly improved, and the contrast ratio is greatly improved. Under normal temperature conditions, the maximum solubility of the dichroic dye in the liquid crystal host LC1 under this proportion is greater than 10%, and the solubility is better. Compared with in the liquid crystal host LC2, the dichroic dye has better stability in the liquid crystal host LC3 under the same addition amount, and the power consumption current of the dye liquid crystal composition is lower.

[0111] Example 11

[0112] The dye liquid crystal composition B7 is composed of a liquid crystal host LC4, a dichroic dye and a chiral agent.

[0113] The composition of the dye liquid crystal composition B7 is specifically as follows in terms of mass percentage: Liquid crystal host LC4 100%, Formula D-AI-2 0.23%, Formula D-BI-4 0.10%, Formula D-II-3 0.12%, Formula D-III-2 0.25%, Formula D-III-3 0.30%, S5011 0.09%.

[0114] The performance parameter test results of the dye liquid crystal composition B7 are as follows: I0=0.11μA, I 180 =0.23μA, t on =10.8ms, t off =20.2ms, T on =35.3%, T off =76.6%, CR=2.2.

[0115] The dye liquid crystal composition B7 as a whole presents black color. Compared with the dye liquid crystal composition A, the response speed of the dye liquid crystal composition B7 is remarkably improved, and the contrast ratio is increased. Under normal temperature condition, the maximum solubility of the dichroic dye under the ratio in the liquid crystal host LC4 is greater than 10%, and the dichroic dye has better solubility. Compared with the dye liquid crystal composition B1 (the composition and the addition amount of the dichroic dye are the same), the dye liquid crystal composition B7 has faster response speed.

[0116] Example 12

[0117] The dye liquid crystal composition B8 is composed of the liquid crystal host LC4, the dichroic dye and the chiral agent.

[0118] The composition of the dye liquid crystal composition B8 in terms of mass percentage is specifically as follows: The liquid crystal host LC4 100%, the formula D-AI-2 0.46%, the formula D-BI-4 0.20%, the formula D-II-3 0.25%, the formula D-III-2 0.50%, the formula D-III-3 0.60%, and S5011 0.09%.

[0119] The performance parameter test results of the dye liquid crystal composition B8 are as follows: I0=0.08μA, I 180 =0.12μA, t on =10.3ms, t off =12.2ms, T on =21.3%, T off =66.9%, CR=3.1.

[0120] The dye liquid crystal composition B8 as a whole presents black color. Compared with the dye liquid crystal composition A, the response speed of the dye liquid crystal composition B7 is remarkably improved, and the contrast ratio is increased. Under normal temperature condition, the maximum solubility of the dichroic dye under the ratio in the liquid crystal host LC1 is greater than 10%, and the dichroic dye has better solubility. Compared with the dye liquid crystal composition B2 (the composition and the addition amount of the dichroic dye are the same), the dye liquid crystal composition B8 has faster response speed.

[0121] It should be noted that the above examples do not limit the present application in any form, and any technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present application.

Claims

1. A dye liquid crystal composition, characterized by, The dye liquid crystal composition is composed of a liquid crystal main body, a dichroic dye and a chiral agent, wherein: The liquid crystal main body is composed of at least one compound represented by general formula I, at least one compound represented by general formula II, at least one compound represented by general formula III and at least one compound represented by general formula IV: I; II; III; IV; R1, R2, R3, R4, R5, R6, R7 each independently represent a straight-chain alkyl group of 1 to 12 carbon atoms, a straight-chain alkoxy group of 1 to 12 carbon atoms or a straight-chain alkenyl group of 2 to 12 carbon atoms; , , , , , each independently represent , , , or ; The dichroic dye is composed of at least one compound represented by general formula D-AI, at least one compound represented by general formula D-BI, at least one compound represented by general formula D-II and at least one compound represented by general formula D-III: D-AI; D-BI; D-II; D-III; DR1, DR2, DR3, DR4, DR5 each independently represent 1 to 10 carbon atom halogenated or non-halogenated alkyl, one or more CH2 groups in the alkyl group can be replaced independently of one another by -C=C-, -CH=CH-, -CF=CF-, -CF=CH-, -CH=CF-, -(CO)O-, -O(CO)-, -(CO)-, -O- or -S-, the O and S atoms are not directly linked; C1, C2 each independently represent , , , amino or 1 to 10 carbon atom halogenated or non-halogenated alkyl, one or more CH2 groups in the alkyl group can be replaced independently of one another by -C=C-, -CH=CH-, -CF=CF-, -CF=CH-, -CH=CF-, -(CO)O-, -O(CO)-, -(CO)-, -O- or -S-, the O and S atoms are not directly linked; L1 represents substituted or non-substituted 1 to 10 carbon atom arylene, substituted or non-substituted 2 to 50 carbon atom heteroarylene, wherein the substituents are 1 to 12 carbon atom alkyl, 1 to 18 carbon atom alkoxy or halogen; L2 represents hydrogen atom, substituted or non-substituted 1 to 12 carbon atom alkyl, substituted or non-substituted 2 to 6 carbon atom alkenyl, substituted or non-substituted 1 to 18 carbon atom alkoxy, substituted or non-substituted 1 to 18 carbon atom alkylamino, substituted or non-substituted 5 to 12 carbon atom cycloalkoxy, substituted or non-substituted 2 to 18 carbon atom alkenyloxy, -C≡N, 1 to 4 carbon atom halogenated alkyl, sulfo, acyl, 2 to 18 carbon atom acylamino, 2 to 18 carbon atom acyloxy, substituted or non-substituted 1 to 10 carbon atom aryl, substituted or non-substituted 2 to 50 carbon atom heteroaryl, wherein the substituents are 1 to 18 carbon atom alkyl, 1 to 18 carbon atom alkoxy or halogen; The chiral agent is R / S811 or R / S5011, and the structures are shown as follows: R / S 811 ; R / S 5011; The compounds represented by general formula I, general formula II, general formula III and general formula IV account for 5-25%, 1-10%, 30-60% and 20-40% of the total weight of the liquid crystal main body respectively, and the compounds represented by general formula D-AI, general formula D-BI, general formula D-II and general formula D-III are used in an amount of 0.23-1.29%, 0.1-0.56%, 0.12-0.67% and 0.55-3.08% of the weight of the liquid crystal main body respectively, and the chiral agent is added in an amount of 0.06-1.5% of the weight of the liquid crystal main body.

2. The dye liquid crystal composition according to claim 1, characterized by The compound represented by general formula I is selected from: I-1 ; I-2; I-3; I-4; I-5; I-6; I-7; I-8; I-9 and I-10.

3. The dye liquid crystal composition according to claim 1, characterized by The compound represented by general formula II is selected from: II-1 ; II-2; II-3; II-4; II-5; II-6; II-7; II-8; II-9 sum II-10.

4. The dye liquid crystal composition according to claim 1, characterized by The compound represented by general formula III is preferably selected from: III-1 ; III-2; III-3; III-4; III-5; III-6; III-7; III-8; III-9 and III-10.

5. The dye liquid crystal composition according to claim 1, characterized by The compound represented by general formula IV is selected from: IV-1 ; IV-2; IV-3; IV-4; IV-5; IV-6; IV-7; IV-8; IV-9 and IV-10.

6. The dye liquid crystal composition according to claim 1, wherein The compound represented by general formula D-AI is selected from: D-AI-1; D-AI-2; D-AI-3; and D-AI-4.

7. The dye liquid crystal composition according to claim 1, wherein The compound represented by general formula D-BI is selected from: D-BI-1; D-BI-2; D-BI-3; and D-BI-4.

8. The dye liquid crystal composition according to claim 1, characterized by The compound represented by general formula D-II is selected from: D-II-1: D-II-2; D-II-3; and D-II-4.

9. The dye liquid crystal composition according to claim 1, characterized by, The compound represented by general formula D-III is selected from: D-III-1; D-III-2; D-III-3; D-III-4; and D-III-5.

10. Use of the dye liquid crystal composition of claim 1 in a normal white mode display device composed of a rigid or flexible substrate.

Images